《情态动词课件》课件.pptVIP

情态动词概述 情态动词表示说话人的语气或对事物的态度，情态动词本身有词义，但不能单独作谓语，必须和原形动词一起构成谓语。情态动词没有人称和数的形式变化。 一.情态动词表示推测的用法 二.情态动词+have done 表示对过去所发生事情的推测或带有某 种语气. 1. I didn’t hear the phone. I must have been asleep. dare and need * * 英语情态动词共有9种，即can,may,will,shall,dare.must,need,ought to,used to.有的情态动词有时态的变化。变化如下： 现在式 can may will shall dare must need ought to ---- 过去式 could might would should dared --- --- --- used to 教学目标：情态动词用法归纳(2) 教学重点： 1.情态动词表示推测; 2.情态动词 + have done 结构； 情态动词可用来表示推测,语气从强到弱的顺序是： １．must所表示的可能性最大，最有把握，意为“一定”。 ２．can和could主要用于否定句和疑问句中 ，can’t或couldn’t 表示“不可能” ３．may 和 might表示现在或将来可能发生的动作 或情况，主要用于肯定句中，might相对于may 来说，表示的可能性更小一些。 must，should，can，could, may ，might。 must have done (过去)肯定/一定… (用于肯定句中) 2. ＊— There were already five people in the car, but they managed to take me as well. —It couldn’t have been a comfortable journey. can’t/couldn’t have done(过去)不可能… 3. ● He may not have finished the exercises, I’m afraid. 4. You could have done better, but you didn’t try your best. may/might have done(过去) 或许/可能做 …(用于肯定或否定句中) could have done (过去) 本能够做 (用于肯定或否定句中,带有责备、劝告之意) 5. ●When we got to the cinema, the film hadn’t started, so we needn’t have worried. ●—Mary didn’t turn up last night, did she? —No, she didn’t need to come. We had changed our plan. needn’t have done (过去)本来不必做… (没有必要做而实际上也没做). 6.She shouldn’t have taken away my tape, for I wanted to use it. should /ought to have done (过去)本应该做(而实际上未做),用于否定句 时则表示过去不该做的事反而做了 (带有后悔、埋怨或责备的语气）。 (06陕西） As you worked late yesterday, you ___ have come this morning. B. may not C. can’t D. mustn’t A A. needn’t ◆(04全国) Mr. White_____ at 8:30 for the meeting, but he didn’t show up. B. should arrive C. should had arrived D. should be arriving ◆(04福建) —